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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5feb5da69b9fecd57b0f2bdd723b06e7dd8a502657ec35d860d6b4bee9d2a3d7' 
  AND token = 'jBDRC2J/ToIB7VvO9FM3sNQrQb5DB7p5JjQxCDpVxYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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