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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcdc35af0a4fa05fad0a9b7a3eab9528b1523cfbedab99078232235b076a2eaf' 
  AND token = '13SWQB5s74qcLdy7Akj13B8rJs5QNeb3MyqHLlftugE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00084

JSON explain

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