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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0032e5033b1e7445391c3143dc1e0f7a15e8befbe2f4226c9858039f9a06009d' 
  AND token = 'X9a2JC7HZZA54COdgyQR03pJ0uEr41eu/3Xgit6uYlg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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