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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92a7b5ea7756ff70bded2832dc405a0cfb6ba424604da6e91f0a266c56350e9a' 
  AND token = 'rD20xPFd8zXPb1WrHxQZ2tRxCPO65Tz1OMAeWhVEi0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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