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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95091be84934f28dedb9f1e685329b752a9cebc6693d45c92c2f7c93384989d9' 
  AND token = 'SwFyS9Q9+y5rr053ana4xh8uIyTnidjsO6ffUWbz6Uc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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