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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b944a5a19d3d3f77e7ecf1fce76c5a3dec082e771eb4826a6ab8e726e056955' 
  AND token = 'P9TRX0L/dtlDxgj9cnb1lFBQrZM5/hViZZJaojA+dNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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