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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a617021e8fb5ac395bd360300395182412fe6fc86a1c3ef158661f69a0d8f779' 
  AND token = 'FvGPcJYkAPZYD5l55/l3KDXEMmvD+IYX9aEfVN4i0ec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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