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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7705ea1f7107ff4b66a052b943e7fa6ff6ef6beb938e54988ecd2c20cd7365ba' 
  AND token = 'PZ4E90XoVcVUuqYz8+MnHvVcaJjrKj1tQdekc76ozJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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