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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9596e0b2e100171a2fa1be7e7dca98b6776182161a495e9ff5e7b668934cf08' 
  AND token = 'QaXv68Vk+fPqONomythPZCWj5a2cUD1KAIBOldxyeS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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