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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cf5ebf7bc71d83c2e47efc17e5c0e27536ff9a0a29ed6ca0d0a2dc8a9c8d731' 
  AND token = '7tHpuVL61SPl+6mXR82LSVjSpoAU+81LS5DrXWtMapg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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