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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf29dad516028af7a572c23c7281bcd3b00d64632dd769ab8ea738883668c3dc' 
  AND token = 'NKCSwZhWQZSeT/6s3OP2IxbSk/kGBq/VblOJJsP77Cc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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