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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73dfc808de6944117fb1e1d1907d5e41da4b1c95f18df7599ef3d25bb121c26b' 
  AND token = 'Ljx8uWVRtnrc59oAlndzeNCsKLSTc9HLoij/fDpThCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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