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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec8e0ace1255bb6f61444c00d6e1596cf7d39c4a0dafecec524477ae3183226f' 
  AND token = 'e5HGXwUJcxclVJNmfSf704o7H5VcNe3c0MHSbTB8x2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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