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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e8e851d44ba6715f3b98d790c78c3e6b98331f3947e3cd38c2b96db285a1575' 
  AND token = 'zCGthdtzAjDrGP+ieTGDpjJYSrLye+bwSBgag7tMbfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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