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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f01a3048ccfee51767ee90710eb3988f9232537f5959761be282352be5e7cd1a' 
  AND token = 'Qrn7TDZNu/chtiNtV8AND2rn8RfMkx3EPqwGE4eFlG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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