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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a7a06767fb4d45f81639ef5a4a32c22fe601c73590ec7f491e951529a15f9f2' 
  AND token = 'svELydka/O2zhNO2ccd6v3idRyc87jxd3KwRtJrvsx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}