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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0b5ec90f54a6baad5796969cad0e07e72ad97d9e338d3c487a85d0f0daf3a01' 
  AND token = 'g1ouS5A6DOQ4rYQ3TygGtBqJYIRhXJ/qUy3r9yvdWPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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