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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7794afe6f1ed064c22b1e2e83abdaaf0e216286fd096f6b7c91b3c1c9fe110f' 
  AND token = 'wDY+YuJiNBd2sbFF/ucbfyLF5LKQoQZ0od6Jn2k3Z7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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