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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2c6a66853bdee5e12a350e1fd90f207feee2e8df9ab6f92401dcf8782512671' 
  AND token = 'Z42qEmKfraBU0xvHac0sybhg9elD2bJITr4LbuLuP3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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