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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdfb89ecca45070b775e619e2ece4f9915160f7a705cb7b24796aac456eb1e4c' 
  AND token = 'Ye4LYjzSTh8wxRciPRWgTzFim78vharaR5ulL5HRX0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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