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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a09a4ba8a6283613e42904b7a45d0cd2b2c199c98969f1f921ff4c5a29292e71' 
  AND token = '+82EZN3Kjx8Irrju5PPmYHw4q2hXxWlEHDj5lwQnqZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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