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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a1961a8d9d4b49da7656f4c68e115d103226520d56f0984da7e93385ba6bff3' 
  AND token = 'Tadmx5NXOxLFkRaGJB1tqpIGT0953PMU4fr8mc+rAMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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