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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ceac6b28a2c88215cecfea16a4f9e8557a0961a7efefeec600e601f218bf0b31' 
  AND token = 'HnJ5eCvqf7tIpCDd8JMZjOZX1Y0Sjf7ZpTcWp70N+oQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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