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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd423f4a0ae9267be5afaf69668fad7ca61004d067672da88ee1c3427b93dccc3' 
  AND token = '/y4YJkPrDdaFgCMd+4ecOCd1v2cKMePJlQhdL5hUQlE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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