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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '531a4c0a7eae47025a16dcaf2bda289afe38ebd786ba2bb6e70b6244ee143f8f' 
  AND token = '1vYZU2IC0pu4xTbNy1umTz240C2DPBwIc+Xco3wvU44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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