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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55affafef1fe2977cca7a54f54037577b371c40356a0bdaf98e5e8b180d559aa' 
  AND token = 'rRPSV3V6nHPr/tcKeHLRBB5FIAA9tjMdN4SXsgD0API=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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