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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7147b2e28b35c6062f350e6fa9bc94163d9bca0a2c85e34521f5b2bd5979838' 
  AND token = 'zcTi5C2Fa6ct0/85opwIfWyigpjJglDDwxePAb2jZkc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00074

JSON explain

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