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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ddd0bbaee80dcad5649edd4ab52b3ac85cb2b9978dac62d26a7a45a84758e92' 
  AND token = 'fpi0VzAqaM2Jw/KluhM9bYVg2lMjvOZ2wLc91DF+E1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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