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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e175a45b7c65cf5d95ae44d58ee406b94d799b890e2c04179eaf919549209b3' 
  AND token = '+KCYG4+uceTnGtcUP0HerSkpzTGOzzElOV1UozVcSBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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