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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdaa7c4490c9d24ca289a244f18240bac0f14df4ccbe521ffe56cf2f44ebbfaa' 
  AND token = 'mWPDk7maBBlrCcALA5lRRIrl4X7vs+QvZE78BeQNYpw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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