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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '940c6eb9ddb023b44ac2474e88906c10b8c8b32e4c7131b74c8589795b3eed03' 
  AND token = 'aOu6Gbr9DE0LxGAagvFehc5roVxn9doZwHTyafRAxrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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