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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '858d6a8a9e4842ef83cf81277f627ac7fca938afbd75abbe9e14dd3758e636f3' 
  AND token = 'GmR6wLual9OpMXLIK1Ad60X8JPWu5659hwr35F+x0xg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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