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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8cbc0b93204f5423dc2fde2a96eb045b1a6d1a7f7e8d12aae7d77b8214eb663' 
  AND token = 'bbUjMUW2HIO509S3NIkHgvF0hSHbEdsUK+dm/cG+83o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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