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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3ab892b7faf3d7a482badb7353672bbcd59c6aa5111b95671b150ac55c6b82e' 
  AND token = 'hnq4+kGux8FDo1/lhrq52eDoyWUXnLZAiiwSSeQPNGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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