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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67c042e3db0bec512aba923b0713d2823faf862f09f982991ae68a74b3263282' 
  AND token = 'GOux1B7R4a3mFUo02qYCe3SZviu5i84yCBO/pyKMKo8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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