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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59dbfb4c83a49e605617ee9b387af0e1def1cc36f32b07e04a14363304c6cad6' 
  AND token = 'wvsKud0nSMPTF3BsK84FjxYzcvsMs9IFifyTEv8kXjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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