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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2831707472b3c650d03569a7fcf9648644cf4ab3d9e2d51a22292f5f4d2b45a' 
  AND token = 'vs8Ach24dlvhyxTuuNnfZl5Ze4m6EE6QYMmJsuJXtyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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