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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32ac6e24db4438a2d43f6da92961cb47ef591ab629da1c57cbe1319823fda780' 
  AND token = 'ZUK739aamTiG5s9k5Piq+2zLckVcwbd/YR2eUED/W8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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