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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5bd7013be3618ece737f9cf2810399bf1de6b5d47046b15a8b4936454ba7a6b' 
  AND token = 'BjtpM8Pgcne97knPXtyWT5tzKaSAS2eO8ap8G4x4+iY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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