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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd170ec5ebea626f2cf3a1221577e4ea4a398fa477a073c4293f85ae95cbe5e81' 
  AND token = 'MVY4B9dLNf6fLuvnhlJCjtwfBTJnCrb5jEzetoHXj9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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