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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a35adbff7c7e96f7d53f6c1dcafefb8c8420e0ce4fdc87790efa4787873ba7db' 
  AND token = 'ly76qhVhScT2iND/iUD5pHlks8rD75j9JLGdiJ865AQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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