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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b03c9f20ab5ee8fc9fac4982638ea91e00d0e508b48ff9d3472a53f588cc03e5' 
  AND token = 'oNXaDBUnCuTALSTGyabiO7tGLAJnxo/23L6qg1qS0xc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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