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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79175154e6beabe1fc2348e1bd46cc6ec35e3a322dccad57b832265d51c2b8d3' 
  AND token = 'NLAelXEWz8jEOh5+Fz8ufNbJqItqU2WyFuX8p2x0PwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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