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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c813cde6fe44d325d0613d3184381ed6b8291c81daa076bc52de1d767af780f' 
  AND token = 'rjFdtuuEk7BkJ/uE2Rl1eHZuy1DqAhdL9xSTHZPQqKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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