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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0772c1685b1ebca04356b8235c0a1fe7cab7ccf36cb3d95c5aabd08757aeb152' 
  AND token = '1/FnrNnN1+3lAauNZnpaEV9Rew8RqU6WO1c573R53v4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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