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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09852e49f5a15ba0e05c64648662694ca4a38f1a56c44ad258217ea6733cb539' 
  AND token = '0aPSrgFI4JpQbQh893MjW6UEttafn1YNsC51IvLB3zc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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