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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9611c406f0541170760bc0621016986af98c9ae1a4784f5507b1bb9218e29227' 
  AND token = 'lPF5guWr1DA5U91L2dmiY6hYrgmzCmH1qmN1PSGjc0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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