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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06ac74db6e380ee603c60ddb75e8994c8ba9f2b59f645134f7ecda855e5676d6' 
  AND token = 'RusRrdPifO5j50lh6Wm1zw/8EanZqTh6MoC+U/BuDXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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