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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d1ba99f2b3db99affbb6dca7b692ded33566d0293325b3af3caca81a310d425' 
  AND token = 'ufd7SGynyp/fey3FyjfGKeg0Sd0x5pjQ9P+phB798Vc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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