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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fd058e8232f3ab90745931e04d797b0e811df2917447e267ea06169429425e1' 
  AND token = 'Vzz2qKbZ4r9sEn+/AhvHQYaZDnSPCcOqbxkS1SEBMS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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