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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7a9eacacf05d9c3fda016482bdc5f159e90ec1e2c4833b62c52d3b5fa74654c' 
  AND token = '8ks5FxWQ5jitv/CdU40XqtsEOBvbDNR+PKag1M3pUG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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