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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc7cebf903ea009788ed2c0db635caf9fd65bbc9b4d8bec49331f1ccaf17c07a' 
  AND token = 'kJq4JyXfTB9M9VVhiGvI6paO2hgtqm2OWGV5HDWLXOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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