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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c819aa6456711b9c61aff42768a32039962d38fe5662d96b48e7c1daf16356d1' 
  AND token = '9RLX/UVD8GqR+GK3r8x3itu2tE697dUqK4mgL890WN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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