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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8dbe1ba7b7d874556bb0b2c1f327477cd73a784e801225f4cca3455774f32fb1' 
  AND token = '6f86/hZ8GXd0+P1bDxFMMLriT2LWkWANp9uCMkvQ0UA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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