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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29324582a69a740fa1e2826d84a413884efcaab3ff2b6d96bf14d3ea128b2bcd' 
  AND token = '3Qh8QOknD5wWFG9S82qR6NjTzp3njhBFtXeANFdaVFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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