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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca1d461140b30c59463bcc5bea79330a7b96bb37f5dbeb195819a3c62d35d842' 
  AND token = 'ss7g1+o+zUbPMLN6I6vB39pjcN/ZRLeimJ9gApcO4Gg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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