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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb790b4920800f23c6c876b19d887c34b68b70e856bcf0d258e64fe43c791490' 
  AND token = 'F1IgDdsSIpF/679SZ4DUuvT3b/HwxJxfi9KgSXzTmMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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